The City of Louisville is a house rule municipality located in southeastern Boulder County, Colorado, United States. The city population was 21,226 at the 2020 United States Census. Louisville began as a mining community in 1877, experienced a period of labor invective early in the 20th century, and transitioned to a suburban residential community past the mines closed in the 1950s.

The town of Louisville dates encourage to the start of the Welch Mine in 1877, the first coal mine in an area of Boulder and Weld counties known as the Northern Coalfield. The town was named for Louis Nawatny, a local landowner who platted his land and named it for himself. Incorporation came several years innovative in 1882.

The Northern Coalfield proved to be very productive, and eventually, some 30 swap mines operated within the current boundaries of Louisville, though not all at the similar time. During the years of zenith production (1907–09), 12 mines were in operation in Louisville, including the Acme Mine whose two million tons of coal came from directly beneath the middle of town. The presence of many independent mining companies in Louisville saved the town from becoming a “company town”, wholly owned and dominated by a single mining company.

Coal from the Northern Coalfield was sub-bituminous (low grade) and could not be transported long distances because of problems similar to self-combustion. Mining generally took place in the winter months since that was the era that demanded fuel for heating. During the summers, the miners played in local baseball leagues, with the home field named “Miners Field”.